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    The protocol to use to communicate with CAS.
    Certain features, such as attributes, may not be available with all protocols.

    <p>
    If unsure, select CAS 3.0. For more information, see the
    <a href="https://apereo.github.io/cas/6.2.x/protocol/Protocol-Overview.html" target="_blank">CAS Protocols</a> documentation.
    Only certain protocols are supported by this plugin.
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